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• 2. TEST DURATION AND PROPOSED SCOPE OF WORK ' The pilot test is expected to begin in August 2005 The length of the test is dependent on field analytical data collected during the test Of particular importance will be the effect that chemical oxidation has on groundwater quality If groundwater quality is protected, the test could fcontinue for several weeks or months At the end of the first week of the test, injection of ozone and hydrogen peroxide will be stopped At this time groundwater samples will be collected from the site to assess groundwater quality and hydrocarbon concentrations If groundwater conditions are favorable, the pilot test will be ' resumed during the third week If the test continues, groundwater sampling and analysis will be conducted monthly until the end of the test, and I month after the test is terminated The scope of work and duration of the pilot test may change based on the field conditions and observations during the course of the pilot test 2.1 TEST DETAILS ' The pilot test will be conducted using a chemical oxidation injection system (PulseOx system manufactured by Applied Process Technology, Inc ) The system generates ozone, which is injected with hydrogen peroxide into existing nested injection points The proposed chemical oxidation event will utilize the three stainless steel nested injection wells, IPI, IP2, and IP3 (two points at each nested injection well — one for peroxide delivery and one for ozone delivery) currently installed at the site These nested injection wells were screened in saturated soils in the source area to allow for the injection of ozone and hydrogen peroxide The existing soil vapor extraction system will be operated to remove any hydrocarbon vapors from the vadose zone which may be volatilized during ozone sparging activities 2.2 CHEMICAL OXIDATION SYSTEM INSTALLATION AND STARTUP The chemical oxidation system, which is housed in a trailer, will be transported to the site and connected to the existing electrical and phone services for the site The trailer will be installed within a fenced enclosure, which will be inside the existing site perimeter fencing ' Each of the system alarm interlocks will be tested prior to system startup to confirm the proper operation of the injection system ' The three injection well points will be connected to the injection system Teflon tubing housed in polyvinyl chloride (PVC) piping will be used for each oxygen/ozone injection point The hydrogen peroxide piping, which will consist of polyethylene tubing, will also be housed in PVC piping Each of the injection wells will be fitted with a pressure gauge and check valve as appropriate for oxygen/ozone and hydrogen peroxide injection The wellhead assemblies will be installed so that field personnel can readily make adjustments during the pilot test Since the ozone lines are individually controlled from the equipment trailer, the Teflon tubing will connect • directly to the stainless steel injection point via a compression fitting G 1Projects1739421MAST£RlWP%WPO7OnOmne Infection Pilot Test Work Plan doe 5